[Praising his High Art will get you everywhere, John. Luffy grins broadly, letting out his classic 'nihihi' cackle as an arm claps John's shoulder cheerfully.]

It is pretty great, isn't it? It's the flag of my pirate crew!

[He withdraws a little from John's personal space, but only to better make eye contact when he adds:]

Hey, since you like it so much, why don't you join too? My nose keeps bleeding when I try to figure out how to look for my friends, but I know they're all really great. So someone who thinks our flag is great must be great too!

[If John has regained his awareness of 21st century memes: it's just this]